After getting in touch with SE, I tried the Master Reset, to no effect.
I then changed the Theme and hey presto, black text on a white background!
Listening to the guy on the phone, it seems like SE have (at some point) put a cheeky update out has changed the text background from blue to white. The update also effected the main menu, there are little graphical changes...
Oh well, I only have to hold out until February (contract ends) and then i'll get an iphone.
Thanks for you advice everyone!
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